'''Tube Alloys''' was a codename of the clandestine research and development
programme, authorised by the Government of the United Kingdom
with participation from Canada, aiming to develop nuclear weapons
for Nuclear weapons and the United Kingdom|the United Kingdom's nuclear weapons
programme during the Second World War.
Starting before the Manhattan Project
(the Western Allies' nuclear bomb project) in 1942, the British efforts were kept highly Classified information in the United Kingdom|classified
such that they had to be referred to by code even within the highest circles of government. At the end of the Second World War, ''Tube Alloys'' came to refer specifically to the element plutonium
, whose very existence was secret until its use in the Atomic bombings of Hiroshima and Nagasaki|atomic bombing of Nagasaki
The Tube Alloys programme in Britain and Canada, effectively the first...